Predictive phase balancing for demand response

ABSTRACT

Predictive phase balancing is implemented by a host system computer and logic executable by the host system computer. The logic is configured to receive customer demand profiles from each customer serviced by a poly-phase grid network and create a demand forecast from anticipated power demands collected from the customer demand profiles. Creating the customer demand profiles includes breaking down loads for each customer by corresponding phases in the poly-phase power grid network. The loads correspond to the anticipated power demands. The logic is also configured to balance the loads among each of the phases based on any load imbalances determined from the demand forecast.

BACKGROUND

The present invention relates to energy distribution, and morespecifically, to predictive phase balancing for demand response.

As industrialized societies continue to grow in an ever-changing globaleconomy, more and more demands are placed on natural resources (e.g.,water, petroleum, minerals, air). Over-consumption of these limitedresources, as well as the effects this consumption has on theenvironment, has understandably become an increasing concern amongvarious individuals, businesses, and organizations which, as a result,are seeking to discover new ways to better manage and preserve them.

One example of a constrained resource is electricity. In the UnitedStates, electrical power may be produced from natural resources by acoalition of providers via power plants and then distributed over one ormore grids. Alternatively, power may be produced and distributed withouta grid via, e.g., independent wind farms or solar cells. As electricpower cannot easily be stored, in order to meet demand, power suppliersattempt to estimate the amount of power required for current, future andnear future operations; however, these estimations do not account forunforeseen events and are not very accurate.

SUMMARY

According to an embodiment of the present invention, a system forimplementing predictive phase balance is provided. The system includes ahost system computer and logic executable by the host system computer.The logic is configured to implement a method. The method includesreceiving customer demand profiles from each customer serviced by apoly-phase grid network and creating a demand forecast from anticipatedpower demands collected from the customer demand profiles. Creating thecustomer demand profiles includes breaking down loads for each customerby corresponding phases in the poly-phase power grid network. The loadscorrespond to the anticipated power demands. The method also includesbalancing the loads among each of the phases based on any loadimbalances determined from the demand forecast.

Additional features and advantages are realized through the techniquesof the present invention. Other embodiments and aspects of the inventionare described in detail herein and are considered a part of the claimedinvention. For a better understanding of the invention with theadvantages and the features, refer to the description and to thedrawings.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The subject matter which is regarded as the invention is particularlypointed out and distinctly claimed in the claims at the conclusion ofthe specification. The foregoing and other features, and advantages ofthe invention are apparent from the following detailed description,taken in conjunction with the accompanying drawings, in which:

FIG. 1 depicts a block diagram of a system upon which predictive phasebalancing may be implemented in an exemplary embodiment;

FIG. 2 illustrates a flow diagram describing a process for implementingpredictive phase balancing in an exemplary embodiment; and

FIG. 3 is a table depicting a sample demand forecast in an exemplaryembodiment.

DETAILED DESCRIPTION

In exemplary embodiments, the management of electrical power generationand distribution in a poly-phase power grid network is provided throughpredictive phase balancing. The exemplary methods described hereinfacilitate production and distribution of electrical power usingpredictive phase balancing for demand response. In one exemplaryembodiment, methods enable power providers to offer discounts to itscustomers for participating in the processes described herein.

One reason that power suppliers experience difficulty in forecastingdemand for power may be because consumers clear lack incentive andknowledge to manage power use or to assist the power supplier inforecasting future needs. As a result, the power supplier lacks reliableinformation in balancing supply and demand, thereby introducingunpredictability into their planning processes. Moving to a system ofcustomer participation in the demand forecasting process, the powersupplier is better able predict and manage how much power will beconsumed, as well as redistribute power according to identified needs.

Turning now to FIG. 1, an exemplary system 100 for providing predictivephase balancing will now be described. The system 100 of FIG. 1 includesa power supplier 150 that forms part of a poly-phase grid network 160.As provided herein, a grid refers to an interconnected electricalnetwork that provides electricity for consumers within a defined region.As shown in FIG. 1, the power supplier 150 includes three circuitconductors (1-3) 102 that produce power in a three-phase process. Thecircuit conductors 102 each carry alternating current of the samefrequency, and each alternating current reaches its peak values atdiffering times. For example, using one current as a reference point,the other two currents are delayed in time by one-third and two-thirds,respectively, of a given cycle (i.e., three complementary currents witha phase separation of one-third cycle). This delay between the phases ofcurrent has the advantage of ensuring constant power transfer for eachcycle of the current. The three phases of current are shown in FIGS. 1as 110, 112, and 114.

The power supplier 150 includes a step-up transformer 104 that processesthe currents 110, 112, and 114 before distribution through the gridnetwork 160. For example, the step-up transformer 104 may perform aconversion to step up the voltage of the currents to one that issuitable for transmission over the network 160.

The poly-phase grid network 160 may include a number of transmissiontowers 130 and substations 132 typically found in a power grid network.These transmission towers 130 and substations 132 further process thecurrents 110, 112, and 114 according to prescribed needs. In addition,the poly-phase grid network 160 includes a number of phase switches 134,which may be implemented in hardware, software, or a combinationthereof. The phase switches 134 are configured to redirect orre-allocate units of electrical power among end user facilities asinstructed by the predictive phase balancing processes described herein.

In an exemplary embodiment, the poly-phase grid network 160 includes ahost system computer 120 that executes logic 122 configured forimplementing the predictive phase balancing processes. The host systemcomputer 120 depicted in FIG. 1 may be implemented using one or moreservers operating in response to one or more computer programs (e.g.,the logic 122) stored in a storage medium accessible by the server. Thehost system computer 120 may operate as a network server (e.g., a webserver) to communicate with network entities, such as the power supplier150, transmission towers 130, substations 132, phase switches 134, andpower consumers or customers, which are illustrated in FIG. 1 asfacilities (1-6) 140. The host system computer 120 handles sending andreceiving information to and from these network entities and can performassociated tasks.

The facilities 140 represent a geographic region 180 serviced by thepower supplier 150. As shown in FIG. 1, and by way of non-limitingexample, the currents 110, 112, and 114 provide power to the region 180(e.g., current 110 services facilities 1 and 2, current 112 servicesfacilities 3 and 4, and current 114 services facilities 5 and 6). Thefacilities 140 may represent any business establishment, such as anindustrial or manufacturing plant, hospital, hotel, etc., or otherestablishment that consumes power. In an embodiment, the power needs ofthe facilities 140 are managed by the host system computer 120 via aservice agreement and a unique account. The host system computer 120 mayutilize the accounts of each of the facilities 140 to identify thefacilities 140 for the purpose of providing the predictive phasebalancing processes described further herein.

In an embodiment, at least some of the facilities 140 include smartmeters 142 that are communicatively coupled to corresponding facilities140 and provide power consumption information over the poly-phase gridnetwork 160 to network entities, such as the host system computer 120and the power supplier 150. The smart meters 142 may be implemented inhardware, software, or a combination thereof to monitor and measurepower usage, and include a transmission means for communicating thisinformation over the network 160.

In an embodiment, each of the facilities 140 communicates its estimatedpower needs to the host system computer 120. These estimations may bederived from information known only to the particular facility fromwhich is originates. For example, if the facility 140 is a hotel, theestimated power demand may be calculated as a function of the occupancyrate of the hotel for the period of time in which the estimated powerdemands are calculated. In this example, if the hotel is experiencing a10% decrease in its average occupancy for the week of January 22, thehotel may reduce the estimated demand by a correlative percentage. Thisinformation is received at the host system computer 120 and processed bythe logic 122 as will be described further herein.

In an embodiment, the host system computer 120 may include internalmemory for storing the account record information for its customers.Additionally, the anticipated power demands provided by the facilities140 may be stored in the memory of the host system computer 120 and maybe linked to the respective account records. The logic 122 may includean interface that guides the facilities 140 through the process ofproviding this information. While this information is described as beingstored in the internal memory of the host system computer 120, it willbe understood that the information may alternatively be stored in aseparate storage device (not shown) that is communicatively coupled tothe host system computer 120.

In an embodiment, the poly-phase grid network 160 further includes acommunications network (e.g., wide area network (WAN), a local areanetwork (LAN), a global network (e.g. Internet), a virtual privatenetwork (VPN), and an intranet for communicating data). The network 160may be implemented using a wireless network or any kind of physicalnetwork implementation known in the art.

The configuration exemplified in FIG. 1 illustrates one example of asystem that employs the predictive phase balancing processes describedherein. It will be understood that variations to the system 100 of FIG.1 may be made in order to realize the advantages of the exemplaryembodiments.

In one exemplary embodiment, once an account is established for thefacility 140, the host system computer 120 prompts the account holder toprovide a projected resource demand (e.g., given in units, such askilowatt hour) for a given time period via, e.g., the user interfacecomponent described above. Additionally, through the account and theuser interface, the host system computer 120 may offer discounts in thecosts of the power in return for providing these estimated powerrequirements.

The host system computer 120 acquires projected demand for otherfacilities 140 and calculates a collective demand forecast. The demandforecast is broken down by phase, as well as time intervals of theprojected demand. FIG. 3 illustrates a demand forecast 300 with sampledata. These, and other features, of the predictive phase balancing willnow be described.

Turning now to FIG. 2, an exemplary process for implementing thepredictive phase balancing is described. At step 202, the logic 122receives a customer demand profile from a facility 140. The customerdemand profile includes anticipated power demands for a customer over aperiod of time. For example, the customer demand profile may becalculated for an upcoming week and may include estimated units of power(e.g., in kilowatt hours) for each time interval of the week. The timeintervals may be configured in any time denomination, such as hourly ordaily.

The host system computer 120 logic 122 creates a demand forecast fromthe customer demand profiles of each of the facilities 140 at step 204.The logic 122 breaks down the loads for each customer by correspondingphases at step 206. For example, as shown in FIG. 3, three phases 310,312, and 314 correspond with currents 110, 112, and 114, respectively.Each entry (e.g., 304) in a phase (e.g., phase 310) reflects theanticipated load (i.e., a quantified value of the load, such as 400kilowatts) for a single facility 140. In addition, as shown in FIG. 3,the logic 122 breaks down the loads for each customer according to atime interval associated with the projected demand at step 208. As shownin FIG. 3, the loads for each facility in a given phase (e.g., 310) andfor a given time interval (e.g., 4-5) are summed up and a totalsummation value (e.g., 306) represents the total load for the facilities140 associated with that phase.

At step 210, the logic 122 analyzes the loads in the demand forecast300. The logic 122 calculates the differences among each of the totalsummation values for phases 310, 312, and 314 at each time interval.Thus, for the time interval identified as 12-1 in FIG. 3, the logic 122calculates the difference between the total summation values 306 inphases 1 and 2 (=100). The logic 122 calculates the difference betweenthe total summation values in phases 2 and 3 (=200). The logic 122 alsocalculates the difference between the total summation values in phases 1and 3 (=100). The maximum difference among the three calculations is200, as reflected in the row 315 under the column relating to the timeinterval 12-1 of FIG. 3. Also, the analysis performed by the logic 122may include determining increases in the anticipated loads across timeintervals. As shown in FIG. 3, for example, increases in loads acrosstime intervals for a given facility are shown in bold font. Anincreasing difference in loads across time intervals An increasingdifference in loads across time intervals for a given phase suggests toan administrator of the power supply system that the loads are becomingmore imbalanced over time, which increases the chance the system willbecome unstable. By identifying these increases in the differences, thepower supplier may become more proactive in performing phase balancing.

In an embodiment, a load is considered to be balanced when the loadvalues are substantially equal; however, slight fluctuations in loadsmay be acceptable. The logic 122 may be configured to utilize apre-defined maximum deviation or difference among the total summationvalues for the phases at a given time interval to determine whether aload imbalance exists. In this manner, the logic 122 calculates thedifferences in the total summation values for the phases at each timeinterval and enters the highest value in the corresponding block in row315. Suppose the maximum allowable difference is set at 300. If anyentries in the row 315 reach or exceed this limit, the loads areconsidered imbalanced for the affected time interval, and the logic 122is configured to implement actions to address the imbalance.

At step 212, the logic 122 determines whether an imbalance exists for agiven time interval. If not, the process returns to step 210 and thelogic 122 continues to analyze the loads.

Otherwise, at step 214, if the logic 122 determines an imbalance hasoccurred for a given time interval, the logic 122 is configured to takeactions directed to balancing the loads within each of the phases for agiven time interval. In an exemplary embodiment, the logic 122 may beconfigured to balance the loads using a greedy algorithm. For example,the logic 112 incrementally removes the smallest load from the phaseidentified as having the highest total summation value and re-allocatesthe smallest load to the phase having the lowest total summation value.The logic 122 then determines if the loads are now balanced using thesame technique identified above. If the loads are still unbalanced, thelogic 122 continues by removing the next smallest load from phaseidentified as having the highest total summation value and re-allocatesthe next smallest load to the phase having the lowest total summationvalue. For example, using the data from the time interval 3-4 in FIG. 3,the maximum difference among the loads is 1,000 units which exceed the300 threshold. The logic 122 removes the smallest load (e.g., 300) fromphase 310 and re-allocates it to phase 314, which has the lowest totalsummation value of 1,300. In an exemplary embodiment, this re-allocationmay be implemented by the logic 122 as an instruction to a correspondingphase switch 134 associated with the facilities 140 subject to the loadtransfer.

Once this re-allocation has been completed, the logic 122 evaluates theloads again to determine whether they are in balance. Using the sameexample above, after re-allocation, the total summation value of phase310 is now 2,000, the total summation value of phase 312 is 1,400, andthe total summation value of phase 314 is now 1,600. The maximumdifference among the phases is now 600 (2,000 minus 1,400). As themaximum difference still exceeds the threshold of 300, the logic 122removes the next smallest load (e.g., 400) from phase 310 (which has thehighest total summation value of 2,000) and re-allocates the load tophase 312, which has the smallest total summation value of 1,400. Afterre-allocation, the total summation value of phase 310 is 1,600, thetotal summation value of phase 312 is 1,800, and the total summationvalue of phase 314 is 1,600, which yields a maximum difference of 200.This difference falls below the set threshold, so the logic 122determines that the loads are now balanced.

In addition to utilizing the customer demand profiles as criteria forre-balancing loads, the logic 122 may also be configured to utilizecurrent power consumption data in determining load imbalances. Forexample, in one embodiment, the logic 122 may receive actual meter datafrom smart meters 142 reflecting actual usage. The customer demandprofiles, which are provided in advance of the time intervals to beevaluated, may at times underestimate the customer's actual needs. Thus,the logic 122 may evaluate the demand forecast 300 of FIG. 3, inconjunction with actual meter usage, in determining whether an imbalancehas occurred. Thus, if at 3:00, the customer load reflecting 1,600 unitsin phase 310 sends meter information that actual usage is substantiallylower, the logic 122 may be configured to delay any re-allocation of thecustomer's load, or may consider an alternative load in the phase tore-allocate.

Technical effects include management of electrical power generation anddistribution in a poly-phase power grid network provided throughpredictive phase balancing. The predictive phase balancing facilitatesproduction and distribution of electrical power using customer demandforecast information specific to the customer, breaks down theinformation by phase and time interval, determines any imbalances inloads associated with the phases and time intervals, and rebalancesloads among the phases for an affected time interval.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting of the invention. Asused herein, the singular forms “a”, “an,” and “the” are intended toinclude the plural forms as well, unless the context clearly indicatesotherwise. It will be further understood that the terms “comprises”and/or “comprising,” when used in this specification, specify thepresence of stated features, integers, steps, operations, elements,and/or components, but do not preclude the presence or addition of oneor more other features, integers, steps, operations, element components,and/or groups thereof.

The corresponding structures, materials, acts, and equivalents of allmeans or step plus function elements in the claims below are intended toinclude any structure, material, or act for performing the function incombination with other claimed elements as specifically claimed. Thedescription of the present invention has been presented for purposes ofillustration and description, but is not intended to be exhaustive orlimited to the invention in the form disclosed. Many modifications andvariations will be apparent to those of ordinary skill in the artwithout departing from the scope and spirit of the invention. Theembodiment was chosen and described in order to best explain theprinciples of the invention and the practical application, and to enableothers of ordinary skill in the art to understand the invention forvarious embodiments with various modifications as are suited to theparticular use contemplated.

The flow diagrams depicted herein are just one example. There may bemany variations to this diagram or the steps (or operations) describedtherein without departing from the spirit of the invention. Forinstance, the steps may be performed in a differing order or steps maybe added, deleted or modified. All of these variations are considered apart of the claimed invention.

As described above, the present invention can be embodied in the form ofcomputer-implemented processes and apparatuses for practicing thoseprocesses. The present invention can also be embodied in the form ofcomputer program code containing instructions embodied in tangiblemedia, such as floppy diskettes, CD-ROMs, hard drives, or any othercomputer-readable storage medium, wherein, when the computer programcode is loaded into and executed by a computer, the computer becomes anapparatus for practicing the invention. The present invention can alsobe embodied in the form of computer program code, for example, whetherstored in a storage medium, loaded into and/or executed by a computer,or transmitted over some transmission medium, such as over electricalwiring or cabling, through fiber optics, or via electromagneticradiation, wherein, when the computer program code is loaded into andexecuted by a computer, the computer becomes an apparatus for practicingthe invention. When implemented on a general-purpose microprocessor, thecomputer program code segments configure the microprocessor to createspecific logic circuits.

While the preferred embodiment to the invention has been described, itwill be understood that those skilled in the art, both now and in thefuture, may make various improvements and enhancements which fall withinthe scope of the claims that follow. These claims should be construed tomaintain the proper protection for the invention first described.

What is claimed is:
 1. A system for implementing predictive phasebalancing, the system comprising: a host system computer; and logicexecutable by the host system computer, the logic configured toimplement a method, the method comprising: transmitting a request, for aprojected power demand, to each customer of a plurality of customersserviced by a poly-phase grid network; receiving corresponding projectedpower demands from at least a portion of the plurality of customers andstoring the projected power demands as customer demand profiles;creating a demand forecast at least in part from the projected powerdemands collected from the customer demand profiles, the creatingcomprising breaking down loads for each customer by corresponding phasesin the poly-phase power grid network, the loads corresponding to theprojected power demands; and balancing the loads among each of thephases based on any load imbalances determined from the demand forecast;wherein the logic is further configured to implement: re-balancing theloads among each of the phases based on load imbalances determined fromdata collected from a smart meter in conjunction with the projectedpower demands received from the plurality of customers.
 2. The system ofclaim 1, wherein the creating further includes breaking down the loadsfor each customer into time intervals, wherein balancing the loads amongeach of the phases includes balancing the loads among the phases withinone of the time intervals.
 3. The system of claim 2, wherein the logicis further configured to implement: determining the load imbalances inthe demand forecast, comprising: summing a quantified value of the loadsin each of the phases and for each of the time intervals resulting in atotal summation value for each of the phases and for each of the timeintervals; storing the loads and corresponding total summation valuesfor each of the phases and at each of the time intervals; and for eachof the time intervals: determining a difference between the summationvalue of a first phase of the phases and a second phase of the phases, adifference between the second phase of the phases and a third phase ofthe phases, and a difference between the first phase and the thirdphase; and upon determining that the difference between any of thesummation values exceeds a threshold value, incrementally removingsmallest loads from the phase having the highest summation value anditeratively re-allocating the smallest loads to other phases until theloads in all of the phases are balanced, the loads determined to bebalanced when each of the summation values is substantially equal to oneanother.
 4. The system of claim 2, wherein the time intervals arerepresented in hours.
 5. The system of claim 2, wherein the timeintervals are represented in days.
 6. The system of claim 1, whereinbalancing the loads among each of the phases is implemented by a phaseswitch in the poly-phase grid network.
 7. The system of claim 1, whereinthe projected power demands for at least one of the customer demandprofiles are calculated as a function of an occupancy rate for afacility of the corresponding customer.
 8. The system of claim 1,wherein transmitting the request for a projected power demand includestransmitting the request for the projected power demand in units ofpower for a given time period; and wherein the host system computerreceives the projected power demand in the requested units of power fromthe customer.
 9. The system of claim 1, further comprising: providing adiscount in an energy bill for the customer in return for participationin providing the host system computer with the projected power demand.